Coherence of NV defects in isotopically enriched 6H-28SiC at ambient conditions

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED Applied Physics Letters Pub Date : 2024-11-13 DOI:10.1063/5.0222098

Fadis Murzakhanov, Georgy Mamin, Margarita Sadovnikova, Evgeniy Mokhov, Sergey Nagalyuk, Marat Gafurov, Victor Soltamov

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Abstract

The unique spin-optical properties of NV defects in SiC, coupled with silicon carbide's advanced technology compared to diamond, make them a promising candidate for quantum technology applications. In this study, using photoinduced pulse ESR at 94 GHz (3.4 T), we reveal the room temperature spin coherence of NV defects in 6H-28SiC, purified to reduce 29Si concentration to ≈1%, four times below its natural level. We demonstrate room temperature (300 K) Hahn-echo coherence time T2 = 23.6 μs, spin–lattice relaxation time T1 = 0.1 ms, and coherent control over optically polarized NV spin states through Rabi nutation experiments. We reveal long inhomogeneous dephasing time T2* = 1.5 μs, which is about five times greater than that measured for NV defects in SiC with natural isotopic content. Our observations highlight again the potential of NV defects in 6H-28SiC, which exhibit near-infrared optical excitation and emission properties compatible with O-band fiber optics, as promising candidates for applications in quantum sensing, communication, and computation.

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环境条件下同位素富集的 6H-28SiC 中 NV 缺陷的相干性

碳化硅中的 NV 缺陷具有独特的自旋光学特性，加上碳化硅的技术比金刚石先进，使其成为量子技术应用的理想候选材料。在这项研究中，我们利用 94 GHz (3.4 T) 的光诱导脉冲 ESR，揭示了 6H-28SiC 中 NV 缺陷的室温自旋相干性，纯化后的 6H-28SiC 中 29Si 的浓度降低到≈1%，比其天然水平低四倍。我们展示了室温（300 K）哈恩回波相干时间 T2 = 23.6 μs，自旋晶格弛豫时间 T1 = 0.1 ms，以及通过拉比突变实验对光极化 NV 自旋态的相干控制。我们发现了较长的不均匀去相时间 T2* = 1.5 μs，这比天然同位素含量的碳化硅中 NV 缺陷的测量值大五倍左右。我们的观察结果再次凸显了 6H-28SiC 中 NV 缺陷的潜力，它表现出与 O 波段光纤兼容的近红外光激发和发射特性，是量子传感、通信和计算应用的理想候选材料。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.